During the metaphase checkpoint, what information is being checked by the cell?
A) if it is large enough to divide
B) if its DNA has been replicated correctly
C) if its chromosomes are properly attached to microtubules
D) if there are sufficient nutrients available
C
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Which of the following is NOT a unifying characteristic of diplomonads and parabasalids?
A) having flagella B) lacking chloroplasts C) lacking mitochondria D) being multicellular
Protection from infection known as species resistance is a result of
A) the lack of suitable environment in the body. B) the absence of receptors required for microbial attachment. C) the presence of phagocytes in the tissues. D) the salty, acidic condition of normal skin. E) both the absence of necessary receptors and lack of suitable environment in the body.
Human viruses that have appeared suddenly or have only recently come to the attention of medical scientists are called _____________.
A. retroviruses B. bacteriophages C. emerging viruses D. viroids
If an enzyme's allosteric binding site is occupied, the enzyme may adopt an alternative conformation that is not optimal for catalysis
a. true b. false